Shell Compressed Folder

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Vladimir Nesterovsky - 30 Jun 2005 15:44 GMT

Hello,

I'm having a trouble with a Shell.Folder object when I'm trying to use it
from a C++ application, but at the same time, the same object works fine
from within html script.

The effect is that, I cannot put data into a compressed folder in C++, in
spite of the fact that all operations succeed.

Note: all this have to work under XP and above, because of integrated
compressed folder shell object.

I appreciate any hint to a what causes this behavior.

It is given:
c:\temp\data.txt - any text file.
c:\temp\data.zip - empty zip file
(compress data.txt manualy, and then remove it from within zip).

C++ program:
---
#import <shell32.dll> named_guids
#include <iostream>

class CoInit
{
public:
CoInit() { CoInitialize(0); }
~CoInit() { CoUninitialize(); }
};

bool CompressFile()
{
try
{
Shell32::IShellDispatchPtr shell(Shell32::CLSID_Shell);
Shell32::FolderPtr destinationFolder =
shell->NameSpace(L"c:\\temp\\data.zip");

if (destinationFolder == 0)
return false;

if (destinationFolder->MoveHere(L"c:\\temp\\data.txt") != S_OK)
return false;

return true;
}
catch(const _com_error &e)
{
std::cout << e.ErrorMessage() << std::endl;

return false;
}
}

int main(int argc, char* argv[])
{
CoInit coInit;
bool result = CompressFile();

std::cout << (result ? "succeed" : "failed") << std::endl;

return 0;
}

---

Html file:
---
<html>
<head>
<script type="text/javascript" language="javascript">

function doClick()
{
var shell = new ActiveXObject("Shell.Application");
var folder = shell.NameSpace("c:\\temp\\data.zip");

if (folder == null)
return false;

folder.MoveHere("c:\\temp\\data.txt");

return true;
}

</script>
</head>
<body>
<button onclick="doClick()">Click me</button>
</body>
</html>
---

Thanks.
--
Vladimir Nesterovsky
e-mail: vladimir@nesterovsky-bros.com
home: http://www.nesterovsky-bros.com

Reply to this Message

Vladimir Nesterovsky - 01 Jul 2005 12:49 GMT

> I'm having a trouble with a Shell.Folder object when I'm trying to use it
> from a C++ application, but at the same time, the same object works fine
[quoted text clipped - 7 lines]
>
> I appreciate any hint to a what causes this behavior.

Well, I've figured out what happens. Shell32::Folder::MoveHere works in an
asynchronous way. This means that operation returns immediately with succeed
code if all parameters are correct, however the actual work is performed
later in a separate thread. This way C++ application exits before it
actually
started the work, and html application succeeds as it's continue running.
Unfortunately, I have found no an easy way to get completion event.

After all, it must be not the easiest way to compress files from the
application. Therefore my question for now is how would I create zip from my
unmanaged application?

Signature

Vladimir Nesterovsky
e-mail: vladimir@nesterovsky-bros.com
home: http://www.nesterovsky-bros.com

Reply to this Message

Carl Daniel [VC++ MVP] - 01 Jul 2005 15:11 GMT

>> I'm having a trouble with a Shell.Folder object when I'm trying to
>> use it from a C++ application, but at the same time, the same object
[quoted text clipped - 20 lines]
> application. Therefore my question for now is how would I create zip
> from my unmanaged application?

ZLIB is your friend (it's what the shell uses under the covers).

http://www.zlib.net/

-cd

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